Screw-jack.



No. 743,290. PATENTED NOV. '3, 1903. M. KETTERER.

SCREW JACK. APPLICATION FILED JULY 27, 1903.

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No. 743,290. PATENTED NOV. 3, 1903-.

" M. KETTERER.

SCREW JACK.

APPLICATION FILED JULY 2?, 1903.

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W1 {3 names 1 mums PETERS no, WOTQLWHQ. \wswumm u '7 Patented November 3, 1903.

PATENT OFFICE.

MAX KETTERER, or SPRINGFIELD, MOI-HO.

SCREW-JACK.

:iPECIFICATION forming part of Letters Patent No. 743,290, dated November 3, 1903.

Application filed July 27,1903. Serial 110.. 167,091. (No model.)

To aZZ whom it ew/y concern.-

Be it known that I, MAX KETTERER,a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Screw-Jacks, of which the following is a specification, reference being had therein 1 to the accompanying drawings.

has for its object to provide a construction whereby when thescrew has run out. or

reached the normal limit of its lifting range the implement may be used to give a further or increased range of lift without the employment of blocks or the necessity of going a v'erticalsectional view of a structure em-- bodying my invention in one form. Fig. 2 is a detail plan section taken on theline m w of Fig. 1 and looking in the direction of the arrows, and Fig. 3 is a view of the separable sleeve detached.

In the said drawings, 1 indicates a base or pedestal, hollow internallyand provided near its upper end withlthe usual screw-thread 2. 3 represents the screw, fitting the screw 2 and provided at its upper end with a swiveled head 1 and with a ratchet device 5 or other suitable means for rotating the screw 3. These parts may be of any suitable construction and difier from those in ordinary use in that the base or pedestal l is adapted to support and hold from rotation the separablesleeve nut hereinafter referred to. To this end I prefer to provide upon the upper end of the base or pedestal above the threaded portion 2 a socket 6, provided with a set-screw 7.

The separable screw-sleeve preferably consists of a cylindrical body divided longitudinally into two parts 8 and 9. I prefer to hinge the two members of the sleeve together, and to this end the part 9 is provided at one of its edges with apertured lugs 10, between which fits a similar apertnred lug 11 on the part 8. A pin 12 passes through the'three lugs and is retained in position by a key or cotter 13,

3 are brought together. This invention relates to screw-jacks, and

i thus forming a readily-separable hinged joint at its other edge. The member 8 is provided with a loop 14, while the member 9 is provided with a tongue 15, extending outward beyond the face of the member 9, so as to pass through the loop 11 and project beyond the same when the two members of the sleeve The projecting end of the tongue 15 is provided with an aperture 16, through which is adapted to pass a locking-pin 17, which may be secured in position by a key or cotter 18. Eachof the members 8 and 9 is provided internally with a screwthreaded portion 19,'the two threaded portions forming when the sleeve is closed a complete thread or nut of the same diameter as r the thread or not 2 and adapted to receive and to fit upon the screw 3. The lower portion of the separable sleeve is preferably unthreaded, as indicated at 20. The lower end of the sleeve is adapted to fit within the socket 6, being supported therein and held from rotation by means of the set-screw 7. I prefer to provide at the lower end of said sleeve a circumferential groove 21, into which the end of the set-screw passes, so that said set-screw will more firmly hold the sleeve against vertical separation from the base or pedestal 1.

At its upper end the sleeve is provided with a socket 22, similar to the socket 6, and with a set-screw 23 or some other means for preventing the rotation of a part inserted into said socket 22.

It will be observed that the separablesleeve nut may be readily detached from the remainder of the jack, it being intended for use only when the desired lift exceeds the nor mal range of the jack. Assuming that the sleeve is thus removed, the screw may be rotated until it has almost run out, thus lifting the load practically to the limit of the ordinary range of the device. When the parts are in this position, there is a sufficient extent of the screw 3 above the upper edge of the base or pedestaLwhich is the upper edge of the wall of the socket 6, to permit the separable sleeve to be placed around the portion of the screw thus extending clear of the pedestal. The sleeve is then placed around said screw, and the two parts thereof are secured together by the means provided for that purpose. The sleeve is then rotated in the proper direction, so as to cause its lower end to enter and seat itself in the socket 6, where it is secured from further rotation relatively to the base by means of the set-screw 7. The screw 3 may be then again rotated, so as to further lift the load, and after the screw passes clear of the lower thread or nut 2 in the base it is still in engagement with the upper thread or nut 19 in the sleeve, so that the range of lifting of the device is increased, practically, by the length of the sleeve. If this increase of lift is not sufficient, a second separable sleeve may be applied on top of the first one in the manner already described, its lower end being secured in the socket 22 by means of the set-screw 23. It is of course obvious that any desired number of sleeves may be employed to further increase the lift.

Where blocking up is undesirable or impracticable, owing to the lack of available blocking material, or the situation in which the screw-jack is being used, or for any other cause,a screw-jack constructed in accordance with my invention may be used, as its employment entirely does away with the usual blocking system.

I do not wish to be understood as limiting myself strictly to the precise details of construction hereinbefore described, and shown in the accompanying drawings, as the same may be obviously modified without departing from the principle of my invention. For instance, I have described the extension-sleeve as being separable and have shown and described in detail a sleeve which is separable in the sense that the two members thereof may be entirely disconnected from each other;

but it is obvious that said sleeve will be separable for the purpose of my invention if the two members are so connected as to be capa- 2. An extension screw-jack comprising a screw provided with a head, a base provided with a thread or nut to fit said screw, and a separable sleeve threaded to fit said screw, one of said two last-mentioned members being provided with a socket to receive the end of the other member and with means for preventing relative rotation of the two members, substantially as described.

3. An extension screw-jack comprising a screw provided with a head, a base provided with a thread or nut to fit said screw, and havinga socket provided with means for preventing rotation of the part engaged therein, and a separable sleeve threaded to fit the screw and adapted to enter the socket, substantially as described.

4. An extension screw-jack comprising a screw provided with a head, a base provided with a thread or nut to fit said screw, and having a circular socket at its upper end provided with a set-screw, and a separable sleeve threaded to fit the screw, the lower end of said sleeve being adapted to enter and be socured within said socket, substantially as described.

5. An extension screw-jack comprising a screw provided with a head, a base provided with a thread or nut to fit said screw and with a socket and means for preventing rotation of a part engaged therein, and a separable sleeve threaded to lit the screw, the lower end of said sleeve being'adapted to fit the socket of the base, and the upper end of said sleeve being provided with a similar socket and means for preventing the rotation of a part engaged therein, substantially as described.

' 6. An extension screw-jack comprising a screw provided with a head, the base provided with a thread or nut to fit said screw, a separable sleeve threaded to tit-said screw and comprising two hinged members provided with means for securing them in position around the screw, and means for supporting said sleeve on said base and preventing its rotation relatively thereto, substantially as described.

In testimony whereof I'affix my signature in presence of two witnesses.

MAX KETTERER.

Witnesses:

E. O. HAGAN, IRVINE MILLER. 

